1994-05-27 05:00:24 +00:00
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.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1994-09-20 22:02:20 +00:00
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.\" From: @(#)getgrent.3 8.2 (Berkeley) 4/19/94
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1994-05-27 05:00:24 +00:00
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.\"
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2003-04-17 14:15:26 +00:00
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.Dd April 16, 2003
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1994-05-27 05:00:24 +00:00
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.Dt GETGRENT 3
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.Os
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.Sh NAME
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.Nm getgrent ,
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2003-04-17 14:15:26 +00:00
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.Nm getgrent_r ,
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1994-05-27 05:00:24 +00:00
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.Nm getgrnam ,
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2003-04-17 14:15:26 +00:00
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.Nm getgrnam_r ,
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1994-05-27 05:00:24 +00:00
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.Nm getgrgid ,
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2003-04-17 14:15:26 +00:00
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.Nm getgrgid_r ,
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1994-05-27 05:00:24 +00:00
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.Nm setgroupent ,
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.Nm setgrent ,
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.Nm endgrent
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.Nd group database operations
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2000-04-21 09:42:15 +00:00
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.Sh LIBRARY
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.Lb libc
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1994-05-27 05:00:24 +00:00
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.Sh SYNOPSIS
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2001-10-01 16:09:29 +00:00
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.In grp.h
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1994-05-27 05:00:24 +00:00
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.Ft struct group *
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.Fn getgrent void
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2003-04-17 14:15:26 +00:00
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.Ft int
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.Fn getgrent_r "struct group *grp" "char *buffer" "size_t bufsize" "struct group **result"
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1994-05-27 05:00:24 +00:00
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.Ft struct group *
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.Fn getgrnam "const char *name"
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2003-04-17 14:15:26 +00:00
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.Ft int
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.Fn getgrnam_r "const char *name" "struct group *grp" "char *buffer" "size_t bufsize" "struct group **result"
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1994-05-27 05:00:24 +00:00
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.Ft struct group *
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.Fn getgrgid "gid_t gid"
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1996-05-23 01:05:25 +00:00
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.Ft int
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2003-04-17 14:15:26 +00:00
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.Fn getgrgid_r "gid_t gid" "struct group *grp" "char *buffer" "size_t bufsize" "struct group **result"
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.Ft int
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1994-05-27 05:00:24 +00:00
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.Fn setgroupent "int stayopen"
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.Ft int
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.Fn setgrent void
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.Ft void
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.Fn endgrent void
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.Sh DESCRIPTION
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These functions operate on the group database file
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.Pa /etc/group
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which is described
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in
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.Xr group 5 .
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Each line of the database is defined by the structure
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2002-12-18 13:33:04 +00:00
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.Vt group
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1994-05-27 05:00:24 +00:00
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found in the include
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file
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2003-09-08 19:57:22 +00:00
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.In grp.h :
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1994-05-27 05:00:24 +00:00
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.Bd -literal -offset indent
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struct group {
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char *gr_name; /* group name */
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char *gr_passwd; /* group password */
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2002-01-22 17:32:53 +00:00
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gid_t gr_gid; /* group id */
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1997-01-30 23:01:49 +00:00
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char **gr_mem; /* group members */
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1994-05-27 05:00:24 +00:00
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};
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.Ed
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.Pp
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The functions
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.Fn getgrnam
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and
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.Fn getgrgid
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search the group database for the given group name pointed to by
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2002-12-18 13:33:04 +00:00
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.Fa name
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1994-05-27 05:00:24 +00:00
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or the group id pointed to by
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2002-12-18 13:33:04 +00:00
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.Fa gid ,
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2004-07-02 23:52:20 +00:00
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respectively, returning the first one encountered.
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Identical group
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1994-05-27 05:00:24 +00:00
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names or group gids may result in undefined behavior.
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.Pp
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The
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.Fn getgrent
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function
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sequentially reads the group database and is intended for programs
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that wish to step through the complete list of groups.
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.Pp
|
2003-04-17 14:15:26 +00:00
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The functions
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.Fn getgrent_r ,
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.Fn getgrnam_r ,
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and
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.Fn getgrgid_r
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are thread-safe versions of
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.Fn getgrent ,
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.Fn getgrnam ,
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and
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.Fn getgrgid ,
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respectively.
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The caller must provide storage for the results of the search in
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the
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.Fa grp ,
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.Fa buffer ,
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.Fa bufsize ,
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and
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.Fa result
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arguments.
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When these functions are successful, the
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.Fa grp
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argument will be filled-in, and a pointer to that argument will be
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stored in
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.Fa result .
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If an entry is not found or an error occurs,
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.Fa result
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will be set to
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.Dv NULL .
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.Pp
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These functions will open the group file for reading, if necessary.
|
1994-05-27 05:00:24 +00:00
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.Pp
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The
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.Fn setgroupent
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function
|
2004-07-02 23:52:20 +00:00
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opens the file, or rewinds it if it is already open.
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If
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1994-05-27 05:00:24 +00:00
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.Fa stayopen
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is non-zero, file descriptors are left open, significantly speeding
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2004-07-02 23:52:20 +00:00
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functions subsequent calls.
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This functionality is unnecessary for
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1994-05-27 05:00:24 +00:00
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.Fn getgrent
|
2005-02-13 22:25:33 +00:00
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as it does not close its file descriptors by default.
|
2004-07-02 23:52:20 +00:00
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It should also
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1994-05-27 05:00:24 +00:00
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be noted that it is dangerous for long-running programs to use this
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functionality as the group file may be updated.
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.Pp
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The
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.Fn setgrent
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function
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is identical to
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.Fn setgroupent
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with an argument of zero.
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.Pp
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The
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.Fn endgrent
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function
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closes any open files.
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.Sh RETURN VALUES
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The functions
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.Fn getgrent ,
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.Fn getgrnam ,
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and
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.Fn getgrgid ,
|
2003-04-17 14:15:26 +00:00
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return a pointer to a group structure on success or
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.Dv NULL
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if the entry is not found or if an error occurs.
|
2004-05-17 22:15:49 +00:00
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If an error does occur,
|
2003-04-17 14:15:26 +00:00
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.Va errno
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will be set.
|
2004-05-17 22:15:49 +00:00
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Note that programs must explicitly set
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.Va errno
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to zero before calling any of these functions if they need to
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distinguish between a non-existent entry and an error.
|
2003-04-17 14:15:26 +00:00
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The functions
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.Fn getgrent_r ,
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.Fn getgrnam_r ,
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and
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.Fn getgrgid_r
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return 0 if no error occurred, or an error number to indicate failure.
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It is not an error if a matching entry is not found.
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(Thus, if
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.Fa result
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is set to
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.Dv NULL
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and the return value is 0, no matching entry exists.)
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.Pp
|
1994-05-27 05:00:24 +00:00
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The functions
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.Fn setgroupent
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and
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.Fn setgrent
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return the value 1 if successful, otherwise the value
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0 is returned.
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The functions
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.Fn endgrent
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and
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.Fn setgrfile
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have no return value.
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.Sh FILES
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.Bl -tag -width /etc/group -compact
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.It Pa /etc/group
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group database file
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.El
|
2005-01-20 09:17:07 +00:00
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.Sh COMPATIBILITY
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The historic function
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.Fn setgrfile ,
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which allowed the specification of alternate password databases, has
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been deprecated and is no longer available.
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1994-05-27 05:00:24 +00:00
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.Sh SEE ALSO
|
1997-02-28 05:46:19 +00:00
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.Xr getpwent 3 ,
|
Add nsswitch support. By creating an /etc/nsswitch.conf file, you can
configure FreeBSD so that various databases such as passwd and group can be
looked up using flat files, NIS, or Hesiod.
= Hesiod has been added to libc (see hesiod(3)).
= A library routine for parsing nsswitch.conf and invoking callback
functions as specified has been added to libc (see nsdispatch(3)).
= The following C library functions have been modified to use nsdispatch:
. getgrent, getgrnam, getgrgid
. getpwent, getpwnam, getpwuid
. getusershell
. getaddrinfo
. gethostbyname, gethostbyname2, gethostbyaddr
. getnetbyname, getnetbyaddr
. getipnodebyname, getipnodebyaddr, getnodebyname, getnodebyaddr
= host.conf has been removed from src/etc. rc.network has been modified
to warn that host.conf is no longer used at boot time. In addition, if
there is a host.conf but no nsswitch.conf, the latter is created at boot
time from the former.
Obtained from: NetBSD
2000-09-06 18:16:48 +00:00
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.Xr group 5 ,
|
2002-01-14 16:59:03 +00:00
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.Xr nsswitch.conf 5 ,
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.Xr yp 8
|
2005-01-20 09:17:07 +00:00
|
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.Sh STANDARDS
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|
The
|
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.Fn getgrent ,
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.Fn getgrnam ,
|
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|
.Fn getgrnam_r ,
|
|
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|
.Fn getgrgid ,
|
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.Fn getgrgid_r
|
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|
and
|
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.Fn endgrent
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functions conform to
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.St -p1003.1-96 .
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The
|
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.Fn setgrent
|
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|
function differs from that standard in that its return type is
|
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.Vt int
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rather than
|
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.Vt void .
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh HISTORY
|
|
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The functions
|
|
|
|
.Fn endgrent ,
|
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.Fn getgrent ,
|
|
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|
.Fn getgrnam ,
|
|
|
|
.Fn getgrgid ,
|
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|
and
|
|
|
|
.Fn setgrent
|
|
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|
appeared in
|
|
|
|
.At v7 .
|
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|
The functions
|
|
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|
.Fn setgrfile
|
|
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and
|
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|
.Fn setgroupent
|
|
|
|
appeared in
|
|
|
|
.Bx 4.3 Reno .
|
2003-04-17 14:15:26 +00:00
|
|
|
The functions
|
|
|
|
.Fn getgrent_r ,
|
|
|
|
.Fn getgrnam_r ,
|
|
|
|
and
|
|
|
|
.Fn getgrgid_r
|
|
|
|
appeared in
|
|
|
|
.Fx 5.1 .
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh BUGS
|
|
|
|
The functions
|
|
|
|
.Fn getgrent ,
|
|
|
|
.Fn getgrnam ,
|
|
|
|
.Fn getgrgid ,
|
|
|
|
.Fn setgroupent
|
|
|
|
and
|
|
|
|
.Fn setgrent
|
|
|
|
leave their results in an internal static object and return
|
2000-03-02 09:14:21 +00:00
|
|
|
a pointer to that object.
|
|
|
|
Subsequent calls to
|
1994-05-27 05:00:24 +00:00
|
|
|
the same function
|
|
|
|
will modify the same object.
|
Add nsswitch support. By creating an /etc/nsswitch.conf file, you can
configure FreeBSD so that various databases such as passwd and group can be
looked up using flat files, NIS, or Hesiod.
= Hesiod has been added to libc (see hesiod(3)).
= A library routine for parsing nsswitch.conf and invoking callback
functions as specified has been added to libc (see nsdispatch(3)).
= The following C library functions have been modified to use nsdispatch:
. getgrent, getgrnam, getgrgid
. getpwent, getpwnam, getpwuid
. getusershell
. getaddrinfo
. gethostbyname, gethostbyname2, gethostbyaddr
. getnetbyname, getnetbyaddr
. getipnodebyname, getipnodebyaddr, getnodebyname, getnodebyaddr
= host.conf has been removed from src/etc. rc.network has been modified
to warn that host.conf is no longer used at boot time. In addition, if
there is a host.conf but no nsswitch.conf, the latter is created at boot
time from the former.
Obtained from: NetBSD
2000-09-06 18:16:48 +00:00
|
|
|
.Pp
|
|
|
|
The functions
|
|
|
|
.Fn getgrent ,
|
2003-04-17 14:15:26 +00:00
|
|
|
.Fn getgrent_r ,
|
Add nsswitch support. By creating an /etc/nsswitch.conf file, you can
configure FreeBSD so that various databases such as passwd and group can be
looked up using flat files, NIS, or Hesiod.
= Hesiod has been added to libc (see hesiod(3)).
= A library routine for parsing nsswitch.conf and invoking callback
functions as specified has been added to libc (see nsdispatch(3)).
= The following C library functions have been modified to use nsdispatch:
. getgrent, getgrnam, getgrgid
. getpwent, getpwnam, getpwuid
. getusershell
. getaddrinfo
. gethostbyname, gethostbyname2, gethostbyaddr
. getnetbyname, getnetbyaddr
. getipnodebyname, getipnodebyaddr, getnodebyname, getnodebyaddr
= host.conf has been removed from src/etc. rc.network has been modified
to warn that host.conf is no longer used at boot time. In addition, if
there is a host.conf but no nsswitch.conf, the latter is created at boot
time from the former.
Obtained from: NetBSD
2000-09-06 18:16:48 +00:00
|
|
|
.Fn endgrent ,
|
|
|
|
.Fn setgroupent ,
|
|
|
|
and
|
|
|
|
.Fn setgrent
|
|
|
|
are fairly useless in a networked environment and should be
|
|
|
|
avoided, if possible.
|
2002-12-18 10:13:54 +00:00
|
|
|
The
|
Add nsswitch support. By creating an /etc/nsswitch.conf file, you can
configure FreeBSD so that various databases such as passwd and group can be
looked up using flat files, NIS, or Hesiod.
= Hesiod has been added to libc (see hesiod(3)).
= A library routine for parsing nsswitch.conf and invoking callback
functions as specified has been added to libc (see nsdispatch(3)).
= The following C library functions have been modified to use nsdispatch:
. getgrent, getgrnam, getgrgid
. getpwent, getpwnam, getpwuid
. getusershell
. getaddrinfo
. gethostbyname, gethostbyname2, gethostbyaddr
. getnetbyname, getnetbyaddr
. getipnodebyname, getipnodebyaddr, getnodebyname, getnodebyaddr
= host.conf has been removed from src/etc. rc.network has been modified
to warn that host.conf is no longer used at boot time. In addition, if
there is a host.conf but no nsswitch.conf, the latter is created at boot
time from the former.
Obtained from: NetBSD
2000-09-06 18:16:48 +00:00
|
|
|
.Fn getgrent
|
2003-04-17 14:15:26 +00:00
|
|
|
and
|
|
|
|
.Fn getgrent_r
|
|
|
|
functions
|
|
|
|
make no attempt to suppress duplicate information if multiple
|
Add nsswitch support. By creating an /etc/nsswitch.conf file, you can
configure FreeBSD so that various databases such as passwd and group can be
looked up using flat files, NIS, or Hesiod.
= Hesiod has been added to libc (see hesiod(3)).
= A library routine for parsing nsswitch.conf and invoking callback
functions as specified has been added to libc (see nsdispatch(3)).
= The following C library functions have been modified to use nsdispatch:
. getgrent, getgrnam, getgrgid
. getpwent, getpwnam, getpwuid
. getusershell
. getaddrinfo
. gethostbyname, gethostbyname2, gethostbyaddr
. getnetbyname, getnetbyaddr
. getipnodebyname, getipnodebyaddr, getnodebyname, getnodebyaddr
= host.conf has been removed from src/etc. rc.network has been modified
to warn that host.conf is no longer used at boot time. In addition, if
there is a host.conf but no nsswitch.conf, the latter is created at boot
time from the former.
Obtained from: NetBSD
2000-09-06 18:16:48 +00:00
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sources are specified in
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.Xr nsswitch.conf 5 .
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